ant項目,這裏是我的單據,用js原生的打印,你會發現,你的樣式基本上沒了,所以我用了html2canvas先截圖,然後再打印
說下思路:將單據截圖,然後打印,但是打印的時候只能打印展示的元素,我並不需要我的截圖被展示出來,所以用css設置下
代碼:
1.安裝後引入 import html2canvas from ‘html2canvas’
2.import Print from ‘./plugins/print/Print’
Vue.use(Print)
// 我應該是把常見的幾個打印的庫都試過了,我這種需求,只能用這個,用其他的多多少少都是問題
///Print.js
// 打印類屬性、方法定義
/* eslint-disable */
const Print = function (dom, options) {
if (!(this instanceof Print)) return new Print(dom, options);
this.options = this.extend({
'noPrint': '.no-print'
}, options);
if ((typeof dom) === "string") {
this.dom = document.querySelector(dom);
} else {
this.isDOM(dom)
this.dom = this.isDOM(dom) ? dom : dom.$el;
}
this.init();
};
Print.prototype = {
init: function () {
var content = this.getStyle() + this.getHtml();
this.writeIframe(content);
},
extend: function (obj, obj2) {
for (var k in obj2) {
obj[k] = obj2[k];
}
return obj;
},
getStyle: function () {
var str = "",
styles = document.querySelectorAll('style,link');
for (var i = 0; i < styles.length; i++) {
str += styles[i].outerHTML;
}
str += "<style>" + (this.options.noPrint ? this.options.noPrint : '.no-print') + "{display:none;}</style>";
str += "<style>html,body,div{height: auto!important;font-size:14px}</style>";
return str;
},
getHtml: function () {
var inputs = document.querySelectorAll('input');
var textareas = document.querySelectorAll('textarea');
var selects = document.querySelectorAll('select');
for (var k = 0; k < inputs.length; k++) {
if (inputs[k].type == "checkbox" || inputs[k].type == "radio") {
if (inputs[k].checked == true) {
inputs[k].setAttribute('checked', "checked")
} else {
inputs[k].removeAttribute('checked')
}
} else if (inputs[k].type == "text") {
inputs[k].setAttribute('value', inputs[k].value)
} else {
inputs[k].setAttribute('value', inputs[k].value)
}
}
for (var k2 = 0; k2 < textareas.length; k2++) {
if (textareas[k2].type == 'textarea') {
textareas[k2].innerHTML = textareas[k2].value
}
}
for (var k3 = 0; k3 < selects.length; k3++) {
if (selects[k3].type == 'select-one') {
var child = selects[k3].children;
for (var i in child) {
if (child[i].tagName == 'OPTION') {
if (child[i].selected == true) {
child[i].setAttribute('selected', "selected")
} else {
child[i].removeAttribute('selected')
}
}
}
}
}
return this.dom.outerHTML;
},
writeIframe: function (content) {
var w, doc, iframe = document.createElement('iframe'),
f = document.body.appendChild(iframe);
iframe.id = "myIframe";
//iframe.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";
iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;');
w = f.contentWindow || f.contentDocument;
doc = f.contentDocument || f.contentWindow.document;
doc.open();
doc.write(content);
doc.close();
var _this = this
iframe.onload = function(){
_this.toPrint(w);
setTimeout(function () {
document.body.removeChild(iframe)
}, 100)
}
},
toPrint: function (frameWindow) {
try {
setTimeout(function () {
frameWindow.focus();
try {
if (!frameWindow.document.execCommand('print', false, null)) {
frameWindow.print();
}
} catch (e) {
frameWindow.print();
}
frameWindow.close();
}, 10);
} catch (err) {
console.log('err', err);
}
},
isDOM: (typeof HTMLElement === 'object') ?
function (obj) {
return obj instanceof HTMLElement;
} :
function (obj) {
return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string';
}
};
const MyPlugin = {}
MyPlugin.install = function (Vue, options) {
// 4. 添加實例方法
Vue.prototype.$print = Print
}
export default MyPlugin
3.執行打印點擊事件
toImage () {
this.confirmLoading = true
window.pageYoffset = 0
document.documentElement.scrollTop = 0
document.body.scrollTop = 0
// 上面這3行的作用是:防止打印出來的頁面頂部有空白
html2canvas(this.$refs.imageWrapper).then(canvas => {
const dataURL = canvas.toDataURL('image/png')
this.printUrl = dataURL
// 取到了截圖圖片的路徑
this.confirmLoading = false
// 執行打印
this.$print(this.$refs.printImg)
})
},
4.如果打印的元素並不希望被用戶看到
<style>
@page
{
size: auto; /* auto is the initial value */
margin: 0mm; /* this affects the margin in the printer settings */
}
// 去掉頁眉頁腳
// 我是很希望可以設置頁眉頁腳的,但是我不知道怎麼寫,所以去掉了,知道的可以跟我說一下哦
@media print {
.none{
display: block !important;
}
}
.none {display:none;}
// 這個的意思就是 打印的時候顯示,正常的時候不顯示
</style>